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improvement: persist cached auth chains in db

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This commit is contained in:
Timo Kösters 2021-08-26 14:18:19 +02:00
parent bef4fe50ce
commit 41d07be97b
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GPG key ID: 24DA7517711A2BA4
4 changed files with 128 additions and 26 deletions
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2
src/client_server/sync.rs
View file

@ -12,7 +12,7 @@ use std::{
time::Duration,
};
use tokio::sync::watch::Sender;
use tracing::{error, warn};
use tracing::error;
#[cfg(feature = "conduit_bin")]
use rocket::{get, tokio};

4
src/database.rs
View file

@ -264,6 +264,8 @@ impl Database {
statekey_shortstatekey: builder.open_tree("statekey_shortstatekey")?,
shortstatekey_statekey: builder.open_tree("shortstatekey_statekey")?,
shorteventid_authchain: builder.open_tree("shorteventid_authchain")?,
roomid_shortroomid: builder.open_tree("roomid_shortroomid")?,
shortstatehash_statediff: builder.open_tree("shortstatehash_statediff")?,
@ -277,7 +279,7 @@ impl Database {
eventid_outlierpdu: builder.open_tree("eventid_outlierpdu")?,
referencedevents: builder.open_tree("referencedevents")?,
pdu_cache: Mutex::new(LruCache::new(100_000)),
auth_chain_cache: Mutex::new(LruCache::new(100_000)),
auth_chain_cache: Mutex::new(LruCache::new(1_000_000)),
shorteventid_cache: Mutex::new(LruCache::new(1_000_000)),
eventidshort_cache: Mutex::new(LruCache::new(1_000_000)),
shortstatekey_cache: Mutex::new(LruCache::new(1_000_000)),

65
src/database/rooms.rs
View file

@ -84,6 +84,8 @@ pub struct Rooms {
pub(super) statehash_shortstatehash: Arc<dyn Tree>,
pub(super) shortstatehash_statediff: Arc<dyn Tree>, // StateDiff = parent (or 0) + (shortstatekey+shorteventid++) + 0_u64 + (shortstatekey+shorteventid--)
pub(super) shorteventid_authchain: Arc<dyn Tree>,
/// RoomId + EventId -> outlier PDU.
/// Any pdu that has passed the steps 1-8 in the incoming event /federation/send/txn.
pub(super) eventid_outlierpdu: Arc<dyn Tree>,
@ -92,7 +94,7 @@ pub struct Rooms {
pub(super) referencedevents: Arc<dyn Tree>,
pub(super) pdu_cache: Mutex<LruCache<EventId, Arc<PduEvent>>>,
pub(super) auth_chain_cache: Mutex<LruCache<Vec<u64>, HashSet<u64>>>,
pub(super) auth_chain_cache: Mutex<LruCache<Vec<u64>, Arc<HashSet<u64>>>>,
pub(super) shorteventid_cache: Mutex<LruCache<u64, EventId>>,
pub(super) eventidshort_cache: Mutex<LruCache<EventId, u64>>,
pub(super) statekeyshort_cache: Mutex<LruCache<(EventType, String), u64>>,
@ -3199,7 +3201,64 @@ impl Rooms {
}
#[tracing::instrument(skip(self))]
pub fn auth_chain_cache(&self) -> std::sync::MutexGuard<'_, LruCache<Vec<u64>, HashSet<u64>>> {
self.auth_chain_cache.lock().unwrap()
pub fn get_auth_chain_from_cache<'a>(
&'a self,
key: &[u64],
) -> Result<Option<Arc<HashSet<u64>>>> {
// Check RAM cache
if let Some(result) = self.auth_chain_cache.lock().unwrap().get_mut(key) {
return Ok(Some(Arc::clone(result)));
}
// Check DB cache
if key.len() == 1 {
if let Some(chain) =
self.shorteventid_authchain
.get(&key[0].to_be_bytes())?
.map(|chain| {
chain
.chunks_exact(size_of::<u64>())
.map(|chunk| {
utils::u64_from_bytes(chunk).expect("byte length is correct")
})
.collect()
})
{
let chain = Arc::new(chain);
// Cache in RAM
self.auth_chain_cache
.lock()
.unwrap()
.insert(vec![key[0]], Arc::clone(&chain));
return Ok(Some(chain));
}
}
Ok(None)
}
#[tracing::instrument(skip(self))]
pub fn cache_auth_chain(&self, key: Vec<u64>, chain: Arc<HashSet<u64>>) -> Result<()> {
// Persist in db
if key.len() == 1 {
self.shorteventid_authchain.insert(
&key[0].to_be_bytes(),
&chain
.iter()
.map(|s| s.to_be_bytes().to_vec())
.flatten()
.collect::<Vec<u8>>(),
)?;
}
// Cache in RAM
self.auth_chain_cache
.lock()
.unwrap()
.insert(key.clone(), chain);
Ok(())
}
}

83
src/server_server.rs
View file

@ -51,7 +51,7 @@ use ruma::{
ServerSigningKeyId, UserId,
};
use std::{
collections::{btree_map, hash_map, BTreeMap, HashMap, HashSet},
collections::{btree_map, hash_map, BTreeMap, BTreeSet, HashMap, HashSet},
convert::{TryFrom, TryInto},
fmt::Debug,
future::Future,
@ -1975,44 +1975,85 @@ fn get_auth_chain(
starting_events: Vec<EventId>,
db: &Database,
) -> Result<impl Iterator<Item = EventId> + '_> {
let mut full_auth_chain = HashSet::new();
const NUM_BUCKETS: usize = 50;
const NUM_BUCKETS: usize = 100;
let mut buckets = vec![HashSet::new(); NUM_BUCKETS];
let mut buckets = vec![BTreeSet::new(); NUM_BUCKETS];
for id in starting_events {
let short = db.rooms.get_or_create_shorteventid(&id, &db.globals)?;
let bucket_id = (short % NUM_BUCKETS as u64) as usize;
buckets[bucket_id].insert((short, id));
if let Some(pdu) = db.rooms.get_pdu(&id)? {
for auth_event in &pdu.auth_events {
let short = db
.rooms
.get_or_create_shorteventid(&auth_event, &db.globals)?;
let bucket_id = (short % NUM_BUCKETS as u64) as usize;
buckets[bucket_id].insert((short, auth_event.clone()));
}
}
}
let mut cache = db.rooms.auth_chain_cache();
let mut full_auth_chain = HashSet::new();
let mut hits = 0;
let mut misses = 0;
for chunk in buckets {
let chunk_key = chunk.iter().map(|(short, _)| short).copied().collect();
if let Some(cached) = cache.get_mut(&chunk_key) {
full_auth_chain.extend(cached.iter().cloned());
if chunk.is_empty() {
continue;
}
// The code below will only get the auth chains, not the events in the chunk. So let's add
// them first
full_auth_chain.extend(chunk.iter().map(|(id, _)| id));
let chunk_key = chunk
.iter()
.map(|(short, _)| short)
.copied()
.collect::<Vec<u64>>();
if let Some(cached) = db.rooms.get_auth_chain_from_cache(&chunk_key)? {
hits += 1;
full_auth_chain.extend(cached.iter().cloned());
continue;
}
misses += 1;
let mut chunk_cache = HashSet::new();
let mut hits2 = 0;
let mut misses2 = 0;
for (sevent_id, event_id) in chunk {
if let Some(cached) = cache.get_mut(&[sevent_id][..]) {
if let Some(cached) = db.rooms.get_auth_chain_from_cache(&[sevent_id])? {
hits2 += 1;
chunk_cache.extend(cached.iter().cloned());
} else {
drop(cache);
let auth_chain = get_auth_chain_inner(&event_id, db)?;
cache = db.rooms.auth_chain_cache();
cache.insert(vec![sevent_id], auth_chain.clone());
chunk_cache.extend(auth_chain);
misses2 += 1;
let auth_chain = Arc::new(get_auth_chain_inner(&event_id, db)?);
db.rooms
.cache_auth_chain(vec![sevent_id], Arc::clone(&auth_chain))?;
println!(
"cache missed event {} with auth chain len {}",
event_id,
auth_chain.len()
);
chunk_cache.extend(auth_chain.iter());
};
}
cache.insert(chunk_key, chunk_cache.clone());
full_auth_chain.extend(chunk_cache);
println!(
"chunk missed with len {}, event hits2: {}, misses2: {}",
chunk_cache.len(),
hits2,
misses2
);
let chunk_cache = Arc::new(chunk_cache);
db.rooms
.cache_auth_chain(chunk_key, Arc::clone(&chunk_cache))?;
full_auth_chain.extend(chunk_cache.iter());
}
drop(cache);
println!(
"total: {}, chunk hits: {}, misses: {}",
full_auth_chain.len(),
hits,
misses
);
Ok(full_auth_chain
.into_iter()